linux-kernel - RE: [PATCH 05/11] i2c: imx-lpi2c: add debug message when i2c peripheral clk doesn't work

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Date:   Fri, 19 Mar 2021 07:07:19 +0000
From:   Clark Wang <xiaoning.wang@....com>
To:     Aisheng Dong <aisheng.dong@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>,
        "christian.koenig@....com" <christian.koenig@....com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 05/11] i2c: imx-lpi2c: add debug message when i2c
 peripheral clk doesn't work


> -----Original Message-----
> From: Aisheng Dong <aisheng.dong@....com>
> Sent: Friday, March 19, 2021 12:57
> To: Clark Wang <xiaoning.wang@....com>; shawnguo@...nel.org;
> s.hauer@...gutronix.de
> Cc: kernel@...gutronix.de; festevam@...il.com; dl-linux-imx <linux-
> imx@....com>; sumit.semwal@...aro.org; christian.koenig@....com;
> linux-i2c@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> kernel@...r.kernel.org
> Subject: RE: [PATCH 05/11] i2c: imx-lpi2c: add debug message when i2c
> peripheral clk doesn't work
> 
> > From: Clark Wang <xiaoning.wang@....com>
> > Sent: Wednesday, March 17, 2021 2:54 PM
> >
> > add debug message when i2c peripheral clk rate is 0, then directly
> > return -EINVAL.
> >
> > Signed-off-by: Gao Pan <pandy.gao@....com>
> > Reviewed-by: Andy Duan <fugang.duan@....com>
> 
> Drop old review when patch is changed
> 
> > ---
> >  drivers/i2c/busses/i2c-imx-lpi2c.c | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c
> > b/drivers/i2c/busses/i2c-imx-lpi2c.c
> > index e718bb6b2387..8f9dd3dd2951 100644
> > --- a/drivers/i2c/busses/i2c-imx-lpi2c.c
> > +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
> > @@ -209,7 +209,12 @@ static int lpi2c_imx_config(struct
> > lpi2c_imx_struct
> > *lpi2c_imx)
> >
> >  	lpi2c_imx_set_mode(lpi2c_imx);
> >
> > -	clk_rate = clk_get_rate(lpi2c_imx->clk);
> 
> I guess the kernel can't compile right before this patch because lpi2c_imx-
> >clk was Removed In former patch You need double check not break bisect

Oh, sorry, I miss this clk definition here.
I will fix this in V2.

> 
> > +	clk_rate = clk_get_rate(lpi2c_imx->clk_per);
> > +	if (!clk_rate) {
> > +		dev_dbg(&lpi2c_imx->adapter.dev, "clk_per rate is 0\n");
> 
> s/dev_dbg/dev_err

Will change to dev_err.
Thanks.


Best Regards,
Clark Wang
> 
> > +		return -EINVAL;
> > +	}
> > +
> >  	if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
> >  		filt = 0;
> >  	else
> > --
> > 2.25.1


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